128 citations · 622 across the 16 of their papers we have counts for
17 papers
Surface quantum dots with pure, coherent, and blinking-free single photon emission
Xin Cao, Jingzhong Yang, Pengji Li +14
The surface of semiconductor nanostructures has a major impact on their electronic and optical properties. Disorder and defects in the surface layer typically cause degradation of…
Photoneutralization of charges in GaAs quantum dot based entangled photon emitters
Jingzhong Yang, Tom Fandrich, Frederik Benthin +7
Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete pho…
Statistical limits for quantum networks with semiconductor entangled photon sources
Jingzhong Yang, Michael Zopf, Pengji Li +9
Semiconductor quantum dots are promising building blocks for quantum communication applications. Although deterministic, efficient, and coherent emission of entangled photons has b…
Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation
Caspar Hopfmann, Nand Lal Sharma, Weijie Nie +3
We present a first comprehensive study on deterministic spin preparation employing excited state resonances of droplet etched GaAs quantum dots. This achievement facilitates future…
Maximally entangled and GHz-clocked on-demand photon pair source
Caspar Hopfmann, Weijie Nie, Nand Lal Sharma +3
We present a 1 GHz-clocked, maximally entangled and on-demand photon pair source based on droplet etched GaAs quantum dots using two-photon excitation. By employing these GaP micro…
Entanglement Swapping with Semiconductor-generated Photons
Michael Zopf, Robert Keil, Yan Chen +4
Transferring entangled states between photon pairs is essential for quantum communication technologies. Semiconductor quantum dots are the most promising candidate for generating p…
Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band
Bianca Höfer, Fabian Olbrich, Jan Kettler +7
We report on optical investigations of MOVPE-grown InGaAs/GaAs quantum dots emitting at the telecom O-band that were integrated onto uniaxial piezoelectric actuators. This promisin…
Frequency Feedback for Two-Photon Interference from Separate Quantum Dots
Michael Zopf, Tobias Macha, Robert Keil +7
We employ active feedback to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic standard. The transmission of a single, rubidium-based Fara…
On-demand semiconductor source of 780 nm single photons with controlled temporal wave packets
Lucas Béguin, Jan-Philipp Jahn, Janik Wolters +8
We report on a fast, bandwidth-tunable single-photon source based on an epitaxial GaAs quantum dot. Exploiting spontaneous spin-flip Raman transitions, single photons at nm…
Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
E. A. Chekhovich, A. Ulhaq, E. Zallo +3
Deep cooling of electron and nuclear spins is equivalent to achieving polarization degrees close to 100% and is a key requirement in solid state quantum information technologies. W…
Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions
Robert Keil, Michael Zopf, Yan Chen +4
Semiconductor InAs/GaAs quantum dots grown by the Stranski-Krastanov method are among the leading candidates for the deterministic generation of polarization entangled photon pairs…
Electric-field-induced energy tuning of on-demand entangled-photon emission from self-assembled quantum dots
Jiaxiang Zhang, Eugenio Zallo, Bianca Höfer +6
The scalability of quantum dot based non-classical light sources relies on the control over their dissimilar emission energies. Electric fields offer a promising route to tune the…
An artificial Rb atom in a semiconductor with lifetime-limited linewidth
Jan-Philipp Jahn, Mathieu Munsch, Lucas Béguin +10
We report results important for the creation of a best-of-both-worlds quantum hybrid system consisting of a solid-state source of single photons and an atomic ensemble as quantum m…
Energy-tunable entangled photon sources on a III-V/Silicon chip
Yan Chen, Jiaxiang Zhang, Michael Zopf +4
Many of the envisioned quantum photonic technologies, e.g. a quantum repeater, rely on an energy- (wavelength-) tunable source of polarization entangled photon pairs. The energy tu…
Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots
Ata Ulhaq, Qingqing Duan, Fei Ding +5
GaAs/AlGaAs quantum dots grown by in-situ droplet etching and nanohole infilling offer a combination of strong charge confinement, optical efficiency, and spatial symmetry required…
Strain-tunable entangled-light-emitting diodes with high yield and fast operation speed
Jiaxiang Zhang, Johannes S. Wildmann, Fei Ding +6
Triggered sources of entangled photons play crucial roles in almost any existing protocol of quantum information science. The possibility to generate these non-classical states of…
Effects of variable anisotropic-strain on the emission of neutral excitons confined in epitaxial quantum dots
J. D. Plumhof, V. Krapek, F. Ding +8
We study the effect of elastic anisotropic biaxial strain on the light emitted by neutral excitons confined in different kinds of semiconductor quantum dots (QDs). We find that the…